40157581649 has 2 divisors, whose sum is σ = 40157581650. Its totient is φ = 40157581648.

The previous prime is 40157581637. The next prime is 40157581703. The reversal of 40157581649 is 94618575104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38256621649 + 1900960000 = 195593^2 + 43600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40157581649 is a prime.

It is a super-2 number, since 2×40157581649² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40157581597 and 40157581606.

It is not a weakly prime, because it can be changed into another prime (40157581609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20078790824 + 20078790825.

It is an arithmetic number, because the mean of its divisors is an integer number (20078790825).

Almost surely, 2^40157581649 is an apocalyptic number.

It is an amenable number.

40157581649 is a deficient number, since it is larger than the sum of its proper divisors (1).

40157581649 is an equidigital number, since it uses as much as digits as its factorization.

40157581649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 40157581649 in words is "forty billion, one hundred fifty-seven million, five hundred eighty-one thousand, six hundred forty-nine".